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@ 2019-06-13T07:47:36Z

<?php

 $array_2 = [

            [
                1, 2, 7
            ],

            [
                4, 5, 6
            ]

    ];

$t = 0;
array_map(function($v) use (&$t){ $t += array_sum($v);}, $array_2);
echo $t;

Output
Performance
VLD
References
Branches

array_map: documentation ( source)
array_sum: documentation ( source)

preferences:dark modelive previewkey bindings

28.15 ms | 405 KiB | 5 Q